Difference between two Vectors

2013 11 9
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更新时间：2013 11 11
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I have two arrays
A = [-1 1 -2 1 -1 1 -1 -2 -1 1];
B = [-1 1 1 -1 1 -1 -1 1];
and i am wanting to find all of the values in A that do not appear in B.
So the answer would appear that
values = [-2 -2 ] % values that are in A but not B
index = [3 8] % location of 'values' in A
thanks

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connor
connor 2013-11-11
Further to my original question, i now need to find the difference between two vectors of different sizes , but the terms that are new will not be unique ie,
a = [-1 1 2 -2 1 -1 -2 -2 1 -1 -2 2 -1 1]
b = [-1 1 2 -2 1 -1 1 -1 -2 2 -1 1]
hence the difference between these two vectors are the two -2 terms at the centre of a .
The current code will only find new terms that have not appeared before but not the difference in the vectors.
Appreciate any help, thanks.

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Azzi Abdelmalek
Azzi Abdelmalek 2013-11-9

1 个投票

A = [-1 1 -2 1 -1 1 -1 -2 -1 1];
B = [-1 1 1 -1 1 -1 -1 1];
a=setdiff(A,B)
index=find(ismember(A,a))
values=A(index)

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connor
connor 2013-11-11
Further to my original question, i now need to find the difference between two vectors of different sizes , but the terms that are new will not be unique ie,
a = [-1 1 2 -2 1 -1 -2 -2 1 -1 -2 2 -1 1] b = [-1 1 2 -2 1 -1 1 -1 -2 2 -1 1] hence the difference between these two vectors are the two -2 terms at the centre of a .
The current code will only find new terms that have not appeared before but not the difference in the vectors.
Appreciate any help, thanks.

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